<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="cartInfo in cartInfoList" :key="cartInfo.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" :checked="cartInfo.isChecked===1"
                   @click="changeIsChecked(cartInfo.skuId, $event.target.checked?1:0)">
          </li>
          <li class="cart-list-con2">
            <img :src="cartInfo.imgUrl">
            <div class="item-msg">{{ cartInfo.skuName }}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ cartInfo.skuPrice }}.00</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="handleChange(cartInfo.skuNum-1, cartInfo)">-</a>
            <input autocomplete="off" type="text" :value="cartInfo.skuNum" minnum="1" class="itxt"
                   @change="handleChange($event.target.value*1, cartInfo)">
            <a href="javascript:void(0)" class="plus" @click="handleChange(cartInfo.skuNum+1, cartInfo)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ cartInfo.skuNum * cartInfo.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a href="#none" class="sindelet" @click="deleteSku(cartInfo.skuId)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked="isAllChecked"
               @click="changeAllChecked($event.target.checked?1:0)">
        <span>全选</span>
      </div>
      <div class="option">
        <a href="#none" @click="deleteAllChecked">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{ checkedNum }}</span>件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {mapGetters} from "vuex";
import {throttle} from "lodash";

export default {
  name: 'ShopCart',
  mounted() {
    this.$store.dispatch('shopCart/getCartList')
  },
  computed: {
    ...mapGetters('shopCart', ['cartInfoList']),
    totalPrice() {
      let total = 0
      this.cartInfoList.forEach((item) => {
        total += item.skuNum * item.skuPrice
      })
      return total
    },
    isAllChecked() {
      return this.cartInfoList.every(item => item.isChecked === 1)
    },
    checkedNum() {
      let total = 0
      this.cartInfoList.forEach((item) => {
        total += item.isChecked
      })
      return total
    }
  },
  methods: {
    changeAllChecked: throttle(async function (newChecked) {
      for (const item of this.cartInfoList) {
        try {
          await this.$store.dispatch('shopCart/updateIsCheckedById', {skuId: item.skuId, isChecked: newChecked})
        } catch (error) {
          alert(error.message)
        }
      }
      await this.$store.dispatch('shopCart/getCartList')
    }, 500),
    handleChange: throttle(async function (newNum, carInfo) {
      if (!isNaN(newNum)) {
        newNum = parseInt(newNum.toString())
        if (newNum >= 1) {
          //最少剩下一个
          try {
            await this.$store.dispatch('detail/addOrUpdateShopCart', {
              skuId: carInfo.skuId, skuNum: newNum - carInfo.skuNum
            })

          } catch (error) {
            alert(error.message)
          }
        }
      }
      //重新从服务器获取数据
      await this.$store.dispatch('shopCart/getCartList')
    }, 500)
    ,//需要节流，要不然可能会点得太快导致个数为负数
    async deleteSku(skuId) {
      try {
        await this.$store.dispatch('shopCart/deleteCartById', skuId)
        //重新从服务器获取数据
        await this.$store.dispatch('shopCart/getCartList')
      } catch (error) {
        alert(error.message)
      }
    },
    changeIsChecked: throttle(async function (skuId, isChecked) {
      try {
        await this.$store.dispatch('shopCart/updateIsCheckedById', {skuId, isChecked})
        await this.$store.dispatch('shopCart/getCartList')
      } catch (error) {
        alert(error.message)
      }
    }, 500),
    async deleteAllChecked() {
      for (const item of this.cartInfoList) {
        try {
          if (item.isChecked) {
            await this.$store.dispatch('shopCart/deleteCartById', item.skuId)
          }
        } catch (error) {
          alert(error.message)
        }
      }
      await this.$store.dispatch('shopCart/getCartList')
    }//或者把这个函数写在state的action中更好，能够让这里更加简化。（实际上应该放到state中）。可以用Promise.all()来判断一个Promise数组是不是全部成功了。
    ,
  }
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;

      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }


        .cart-list-con4 {
          width: 10%;

        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>